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EP1883157A4 - Boundary acoustic wave device - Google Patents

Boundary acoustic wave device

Info

Publication number
EP1883157A4
EP1883157A4 EP06732307A EP06732307A EP1883157A4 EP 1883157 A4 EP1883157 A4 EP 1883157A4 EP 06732307 A EP06732307 A EP 06732307A EP 06732307 A EP06732307 A EP 06732307A EP 1883157 A4 EP1883157 A4 EP 1883157A4
Authority
EP
European Patent Office
Prior art keywords
acoustic wave
electrode
boundary acoustic
wave device
resonator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06732307A
Other languages
German (de)
French (fr)
Japanese (ja)
Other versions
EP1883157A1 (en
Inventor
Hajime Kando
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of EP1883157A1 publication Critical patent/EP1883157A1/en
Publication of EP1883157A4 publication Critical patent/EP1883157A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/25—Constructional features of resonators using surface acoustic waves
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/0023—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output
    • H03H9/0028—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices
    • H03H9/0047—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices having two acoustic tracks
    • H03H9/0066—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices having two acoustic tracks being electrically parallel
    • H03H9/0071—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns, or networks having balanced input and output using surface acoustic wave devices having two acoustic tracks being electrically parallel the balanced terminals being on the same side of the tracks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/0222—Details of interface-acoustic, boundary, pseudo-acoustic or Stonely wave devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/02—Details
    • H03H9/02535—Details of surface acoustic wave devices
    • H03H9/02543—Characteristics of substrate, e.g. cutting angles
    • H03H9/02559—Characteristics of substrate, e.g. cutting angles of lithium niobate or lithium-tantalate substrates
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators
    • H03H9/46—Filters
    • H03H9/64—Filters using surface acoustic waves
    • H03H9/6489—Compensation of undesirable effects
    • H03H9/6493—Side lobe suppression

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)

Abstract

A boundary acoustic wave device which can suppress an undesired response due to interdigital capacitive electrode. The boundary acoustic wave device comprises a first medium, a second medium laid on the first medium, and a plurality of electrodes arranged on the boundary between the first and second media, characterized in that a filter and/or a resonator and a capacitor connected electrically with the filter and/or the resonator are constituted of the plurality of electrodes, each of the filter and/or the resonator is constituted using an IDT electrode, the capacitor is formed of an interdigital capacitive electrode, and a relation Vm/λm<Vc/λc is satisfied assuming the period of electrode finger of the IDT is λm, the sound velocity of a boundary acoustic wave in the IDT is Vm, the period of electrode finger of the interdigital capacitive electrode is λc, and the lower one of sound velocities of slow transverse waves in the electrode finger normal direction of the interdigital capacitive electrode of the first and second media is Vc.
EP06732307A 2005-05-16 2006-04-25 Boundary acoustic wave device Withdrawn EP1883157A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005142839 2005-05-16
PCT/JP2006/308597 WO2006123518A1 (en) 2005-05-16 2006-04-25 Boundary acoustic wave device

Publications (2)

Publication Number Publication Date
EP1883157A1 EP1883157A1 (en) 2008-01-30
EP1883157A4 true EP1883157A4 (en) 2008-10-08

Family

ID=37431097

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06732307A Withdrawn EP1883157A4 (en) 2005-05-16 2006-04-25 Boundary acoustic wave device

Country Status (6)

Country Link
US (1) US7394336B2 (en)
EP (1) EP1883157A4 (en)
JP (1) JP4665965B2 (en)
KR (1) KR100889231B1 (en)
CN (1) CN101167247B (en)
WO (1) WO2006123518A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106105031B (en) * 2014-04-11 2018-12-21 株式会社村田制作所 Acoustic wave filter device
JP6465065B2 (en) * 2016-04-25 2019-02-06 株式会社村田製作所 Elastic wave device
WO2018056056A1 (en) * 2016-09-21 2018-03-29 株式会社村田製作所 Elastic wave device, high-frequency front end circuit, and communication device
WO2018135538A1 (en) * 2017-01-19 2018-07-26 株式会社村田製作所 High frequency filter, high frequency front end circuit and communication device
WO2018139320A1 (en) * 2017-01-30 2018-08-02 株式会社村田製作所 High frequency filter, high frequency front end circuit and communication device
CN118249775B (en) * 2024-05-24 2024-10-01 中国科学技术大学 An acoustic resonator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07273597A (en) * 1994-03-29 1995-10-20 Oki Electric Ind Co Ltd Surface acoustic wave filter of resonator type
EP0920129A1 (en) * 1997-05-08 1999-06-02 Kabushiki Kaisha Toshiba Elastic boundary wave device and method of its manufacture
US20020158708A1 (en) * 2001-04-27 2002-10-31 Kenji Inoue Surface acoustic wave filter, package for surface acoustic wave filter and surface acoustic wave filter module
WO2004109913A1 (en) * 2003-06-04 2004-12-16 Epcos Ag Electroacoustic component and method for the production thereof
WO2005004327A1 (en) * 2003-07-07 2005-01-13 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and device employing it

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5830217A (en) 1981-08-17 1983-02-22 Hitachi Ltd elastic wave device
JPS645113A (en) 1987-06-29 1989-01-10 Hitachi Ltd Surface acoustic wave device
JP3291860B2 (en) 1993-09-02 2002-06-17 株式会社村田製作所 Vertical double mode surface acoustic wave filter
JPH07283688A (en) 1994-04-07 1995-10-27 Matsushita Electric Ind Co Ltd Surface acoustic wave filter
JP2000114917A (en) 1998-09-30 2000-04-21 Kyocera Corp Balanced surface acoustic wave filter
JP3729081B2 (en) * 2000-06-27 2005-12-21 株式会社村田製作所 Surface acoustic wave device
JP2002111444A (en) * 2000-09-29 2002-04-12 Toyo Commun Equip Co Ltd Coupled surface acoustic wave filter
JP2002111443A (en) * 2000-09-29 2002-04-12 Toyo Commun Equip Co Ltd Coupled surface acoustic wave filter
JP3952907B2 (en) * 2002-08-28 2007-08-01 株式会社村田製作所 Surface acoustic wave device, communication device
JP2004140738A (en) 2002-10-21 2004-05-13 Toyo Commun Equip Co Ltd Surface acoustic wave filter
ATE451752T1 (en) 2003-02-10 2009-12-15 Murata Manufacturing Co ELASTIC LIMIT SHAFT DEVICE

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07273597A (en) * 1994-03-29 1995-10-20 Oki Electric Ind Co Ltd Surface acoustic wave filter of resonator type
EP0920129A1 (en) * 1997-05-08 1999-06-02 Kabushiki Kaisha Toshiba Elastic boundary wave device and method of its manufacture
US20020158708A1 (en) * 2001-04-27 2002-10-31 Kenji Inoue Surface acoustic wave filter, package for surface acoustic wave filter and surface acoustic wave filter module
WO2004109913A1 (en) * 2003-06-04 2004-12-16 Epcos Ag Electroacoustic component and method for the production thereof
WO2005004327A1 (en) * 2003-07-07 2005-01-13 Matsushita Electric Industrial Co., Ltd. Surface acoustic wave filter and device employing it
US20050231306A1 (en) * 2003-07-07 2005-10-20 Hiroshi Kushitani Surface acoustic wave filter and device employing it

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2006123518A1 *

Also Published As

Publication number Publication date
US7394336B2 (en) 2008-07-01
KR100889231B1 (en) 2009-03-17
CN101167247B (en) 2012-02-29
CN101167247A (en) 2008-04-23
US20080042781A1 (en) 2008-02-21
JP4665965B2 (en) 2011-04-06
WO2006123518A1 (en) 2006-11-23
EP1883157A1 (en) 2008-01-30
KR20080002946A (en) 2008-01-04
JPWO2006123518A1 (en) 2008-12-25

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